PDF malware analysis — malicious · 780a4642a9345070

MALICIOUS

PDF

431.5 KB Created: -ç-Ö"'}¶Ï¿t_Æ Authoring application: ¹y sv9ìòduÜÒÓcSÚ#.úp+{OÆ=z`!Ò]t (via ¹y sv9ìòduÜÒÍÜI'ZÕ$ 7°y5f wÇGdnß[jÌ{)

MD5: 9995494de22da462930e95808f80f8b0 SHA-1: 63e4f5dd3bf162951a67a0cb8483b0fab0ec3795 SHA-256: 780a4642a9345070e945821c039190655468cb0d5d5c9c3ce68d2ba8ae1fd367

76 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by an ML classifier and contains an embedded script payload. It is designed as an image-only lure, which is a common tactic to bypass content analysis and trick users into interacting with malicious links. The embedded script likely facilitates the redirection to the provided URL, which is a known popunder domain.

Machine Learning

Nyx PDF Classifier malicious score 0.6220

Heuristics 5

Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
PDF paints image(s) but contains no text operators medium PDF_IMAGE_ONLY_LURE

PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
Encrypted PDF (string and stream contents are opaque to static scan) info PDF_ENCRYPTED

PDF declares /Encrypt — string objects and stream contents are encrypted with the standard security handler (RC4 or AES). On its own this is informational; legitimate encrypted documents include signed contracts, billing statements, and rights-managed material. Static heuristics cannot inspect encrypted payload bytes.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://www.ciudad.com.ar/ar/popunder/p_submit.asp?site=personales.ciudad.com.ar

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_018_off0003025f.bin` `ba845a49fdad4f51a0e7025226a8a6f4ea897e31b271ad788f442f66fb954b4b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3025F	74844 bytes
`stream_020_off0003b621.bin` `6b32d736d00b0adc7ae05bcc1fa05ae92c0e4dbfbbaf38d2c31482e9071fa319`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3B621	75096 bytes
`stream_035_off000681dc.bin` `dbd277ce434ca65f304ebc00bfeb5fe8c4268729c356d258e78d6e8561c4bf78`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x681DC	768 bytes
`stream_040_off00069181.bin` `7d3bb8dc5199681a46d9c0db1bae0464ec9d00c6c96cee300c2b8284783c1fd5`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x69181	768 bytes
`embedded_pdf_script_0006bd5a.bin` `54cf1c657bf68ad4ff191e59e87aeb6c6607c857c10ff6f92b3b3fb0daa21d44`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x6BD5A	441853 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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